Acoustic coupler adapter



FIG. 1 is a top perspective view of an acoustic coupler, showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left elevation view thereof; and

FIG. 7 is a right elevation view thereof. 

The ornamental design for an acoustic coupler adapter, substantially as shown and described. 